Mereiterite Mineral Data

Mereiterite Mineral Data +

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General Mereiterite Information

Chemical Formula:

K2Fe++(SO4)2·4(H2O)

Composition:

Molecular Weight = 398.23 gm

Potassium 19.64 % K 23.65 % K₂O

Iron 14.02 % Fe 18.04 % FeO

Hydrogen 2.02 % H 18.10 % H₂O

Sulfur 16.10 % S 40.21 % SO₃

Oxygen 48.21 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K₂Fe²⁺(SO₄)₂·4(H₂O)

Environment:

In a pocket in marble.

IMA Status:

Approved IMA 1995, Dana # Changed (28.4.3.3)

Locality:

The D-level of the Hilarion adit, Agios Konstadinos, Lavrion Mining District, Greece. Link to MinDat.org Location Data.

Name Origin:

For Dr. Kurt Mereiter (1945- ), Technical University of Vienna, Austria.

Synonym:

Dana 28.4.3.3

ICSD 79854

IMA1993-045

PDF 46-1437

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Mereiterite Crystallography

Axial Ratios:

a:b:c =1.2395:1:1.0407

Cell Dimensions:

a = 11.841, b = 9.553, c = 9.942, Z = 4; beta = 94.9° V = 1,120.50 Den(Calc)= 2.36

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.444(1), 3.505(0.52), 2.39(0.49),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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Hertweck B , Giester G , Libowitzky E , American Mineralogist , 86 (2001) p.1282-1292, The crystal structures of the low-temperature phases of leonite-type compounds,, K2Me(SO4)2.4H2O (Me=Mg,Mn,Fe), Sample: K2Fe(SO4)2.4H2O, T = 185 K

View Additional jPOWD Structure files for Mereiterite
[1] [2]

Physical Properties of Mereiterite

Cleavage:

None

Color:

Pale yellow.

Density:

2.36

Diaphaniety:

Transparent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Crystalline - Coarse - Occurs as well-formed coarse sized crystals.

Hardness:

2.5-3 - Finger Nail-Calcite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Mereiterite

Gladstone-Dale:

CI meas= 0.001 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2129,KPDmeas= 0.2129,KC= 0.213

Optical Data:

Biaxial (+), a=1.497, b=1.501, g=1.509, bire=0.0120, 2V(Calc)=72, 2V(Meas)=73. Dispersion very weak, r > v.

Calculated Properties of Mereiterite

Electron Density:

r_electron=2.37 gm/cc
note: r_Mereiterite=2.36 gm/cc.

Fermion Index

Fermion Index = 0.00443
Boson Index = 0.99557

Photoelectric:

PE_Mereiterite= 7.02 barns/electron
U=PE_Mereiterite x r_electron= 16.64 barns/cc.

Radioactivity:

GRapi = 284.59 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Mereiterite - barely detectable

Mereiterite Classification

Dana Class:

29.3.3.4 (29)Hydrated Acid and Sulfates

(29.3)where (A+)2 B (XO4)2 · x(H2O)

(29.3.3)Dana Group

29.3.3.1 Blodite Na2Mg(SO4)2·4(H2O) P 2₁/a 2/m

29.3.3.2 Nickelblodite Na2(Ni,Mg)(SO4)2·4(H2O) P 2₁/a 2/m

29.3.3.3 Leonite K2Mg(SO4)2·4(H2O) C 2/m 2/m

29.3.3.4 Mereiterite ! K2Fe(SO4)2·4(H2O) C 2/m 2/m

29.3.3.5 Changoite! Na2Zn(SO4)2·4(H2O) P 2₁/a 2/m

Strunz Class:

VII/C.18-35 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+

VII/C.18 - Wicksite - Alentaite series

VII/C.18-10 Wicksite NaCa2(Fe,Mn)4MgFe(PO4)6·2(H2O) P bca 2/m 2/m 2/m

VII/C.18-15 Bederite! ([],Na)Ca2(Mn,Mg,Fe)2(Fe,Mg,Al)2Mn2(PO4)6·2(H2O) Pcab 2/m 2/m 2/m

VII/C.18-20 Grischunite NaCa2Mn5Fe(AsO4)6·2(H2O) Pcab 2/m 2/m 2/m

VII/C.18-30 Walentaite (Ca,Mn,Fe)Fe3(AsO4)(PO4)3(PO3OH) I mmm, I bam, I bca, I mma Ortho

VII/C.18-35 Mereiterite K2Fe(SO4)2·4(H2O) C 2/m 2/m

Other Mereiterite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.81,1996) OPTIC PROP.(MinRec)

See Also:

Links to other databases for Mereiterite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST

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Mereiterite

K2Fe++(SO4)2·4(H2O)
Dana No: 29.3.3.4 Strunz No: VII/C.18-35
Locality:

Notes: